Good afternoon! I'm the traveling CRD tech, and I'm sure sooner or later someone would have suggested you search for me. I just happened to see your thread first I guess.
Knocking on acceleration can be a number of things, some are cheap and easy to check, others require a bit more investigation. The cheap things are whether the engine has any codes - underboost is a clue - and removing the intake hoses between the turbo and the intercooler and the intercooler and the engine - and carefully inspecting these for tears. Frequently the result of a boost leak is knocking on acceleration and lots of smoke out the back. BUT if the engine has detected the loss of boost, then it may have set the code and "turned off" the turbo so you will still not have enough air, but it won't be overfueling quite as much after that. Idle performance may be smooth and normal though because there is no boost needed at idle.
Getting into the more expensive things are the possibility of rockers or injectors that need work, I have come upon a number of CRDs recently where the injectors are not testing within spec by a wide margin (20-30% off) and that can definitely adversely affect the performance. The rockers can be checked with the sound and the MAF reading at idle from the computer - If the sound is uneven, that is a possible indication. If the MAF reads 16 or above, the rockers are probably good, 15 or below there is possibly an issue. It is not a 100% test obviously, but it can be informative with other information.
Do you know whether the timing belt and water pump have been serviced on this CRD? If the timing is off or has "slipped" because of age, that would also be a prime reason for a knock on acceleration, but would be a good reason for the rockers to be damaged (they are the designed failure point if the timing is not correct) and the belt is SERIOUSLY overdue if it has not been changed, the age limit is 6 years or 100k miles... Chrysler "forgot" to put the age into the owner's manual so that they could avoid possibly having to pay for the replacement under the warranty.
As for me - I work on CRDs all across the country, and I've been to Austin several times. I would be happy to discuss your CRD with you and create a plan to come and look it over / repair what needs service. I generally focus my efforts on the engine of these unique vehicles, any qualified shop can help with the normal things like tires or suspension etc as those are not special to the CRD.
The easiest way for us to chat is via email (button below) as the private message system on the forum doesn't seem to send notifications anymore for some reason. Welcome to the CRD club! --Jim
_________________ Proud supporting vendor of LOST Jeeps TRAVELING CRD TECH. I come to you! Need help? Just ask! I've taken it apart more than most. Email jeep [at] maincomputer [dot] com - BOARD MESSAGING IS BROKEN Over 125 CRDs currently driving with my timing belt, rockers, or ARP Studs. Bad noises = REALLY bad things.
|